I glad to present jQuery Keyfilter Plugin. This plugin filters keyboard input by specified regular expression. * <a href="http://jquery-keyfilter.googlecode.com/svn/trunk/ demo.html/">Try out a demonstration</a>. * <a href="http://code.google.com/p/jquery-keyfilter/downloads/ list">Download</a>. This plugin also already uploaded to http://plugin.jquery.com/ I recommend to use it with <a href="http://bassistance.de/jquery- plugins/jquery-plugin-validation/">jQuery Validate</a> plugin to provide robust way to filter and validate client input. Of course, server-side validation required too. With best regards, Akzhan.